File:Museo della Specola di Bologna abc2 specchio a tasselli.jpg
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Italiano: Specchio a tasselli di Guido Horn D'Arturo (1879-1967) del 1952, di 1,80 metri di diametro e composto da 61 tasselli. Ogni tassello ha una curvatura sferica di 20,82 m di raggio, e una distanza focale di 10,41 m. Lo specchio a tasselli rappresentava l'obiettivo del telescopio zenitale posto al primo piano della torre della Specola. Da un foro della terrazza al penultimo piano riceveva la luce fino agli anni 1980, quando fu smantellato. Lo specchio era posto sopra a un portalastre mobile, per permettere di seguire un astro nel suo passaggio zenitale. Oltree 17000 lastre fotografiche sono state ottenute da Horn d'Arturo e collaboratori che hanno utilizzato questo telescopio per un'indagine sistematica del cielo zenitale locale e hanno scoperto una dozzina di stelle variabili.
Alla fine degli anni 1980 lo specchio è stato recuperato e rimontato nella posizione originaria al Museo della Specola di Bologna, museo specializzato nello sviluppo e nell'evoluzione della strumentazione astronomica tra Settecento e Ottocento. Vedi anche [1] e [2] English: The segmented mirror of 1.8 meter of diameter consists of 61 tassels. It was created and assembled by Guido Horn D'Arturo (1879-1967), who installed it in the astronomical tower in Bologna in 1952, called the Specola Tower. More than 17000 photographic plates were obtained by Horn d'Arturo and collaborators who used this telescope for a systematic survey of the local zenithal sky and discovered a dozen of variable stars. Each tassel has a spherical curvature of 20.82 meter of radius, and a focal distance of 10.41 meter. The segmented mirror represented the objective of the “tessellated telescope”, a zenith telescope installed on the first floor in the astronomical tower of Bologna, called Specola. It received light from a hole at the penultimate floor until. The mirror was placed on top of a movable plate holder to allow a star to be followed in its zenithal passage. At the end of the 1980s, the mirror dismantelled some years before has been recovered and reassembled in its original position. Now it is part of the collection of the Specola Museum, a specialized museum collecting astronomical instruments between the 18th and 19th centuries, hold by the University of Bologna. |
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| Source | Own work |
| Author | Patafisik |
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